From: Pádraig Brady <P@draigBrady.com>
Date: Tue, 1 Jul 2025 21:52:16 +0000 (+0100)
Subject: tests: cat: add test for O_APPEND bug fix
X-Git-Tag: v9.8~252
X-Git-Url: http://git.ipfire.org/?a=commitdiff_plain;h=8771957703cf4f8d71f2d04ef0614d2aeb0c65ee;p=thirdparty%2Fcoreutils.git

tests: cat: add test for O_APPEND bug fix

* tests/cat/cat-self.sh: Add a test case
for commit v9.6-19-g7386c291b
---

diff --git a/tests/cat/cat-self.sh b/tests/cat/cat-self.sh
index 3c171b40b2..2d09fc0877 100755
--- a/tests/cat/cat-self.sh
+++ b/tests/cat/cat-self.sh
@@ -50,4 +50,14 @@ returns_ 1 cat - fx4 <fx 1<>fx4 || fail=1
 returns_ 1 cat fx5 >>fx5 || fail=1
 returns_ 1 cat <fx6 >>fx6 || fail=1
 
+# coreutils 9.6 would fail with a plain cat if the tty was in append mode
+# Simulate with a regular file to simplify
+echo foo > file || framework_failure_
+# Set fd 3 at EOF
+exec 3< file && cat <&3 > /dev/null || framework_failure_
+# Set fd 4 in append mode
+exec 4>> file || framework_failure_
+cat <&3 >&4 || fail=1
+exec 3<&- 4>&-
+
 Exit $fail